SlideDir focus w/ animation

Add an animated "focus" mode for SlideDir.

Clicking a cell focuses.  SPACE unfocuses.

When a slide is focused, mouse and key events are passed through.

TBR=
Change-Id: Iec47e2327e3b21bd626846bb0d3f9107bf680b1b
Reviewed-on: https://skia-review.googlesource.com/108101
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 20 insertions, 6 deletions

diff --git a/tools/viewer/SlideDir.h b/tools/viewer/SlideDir.h
index a4c5f6da0a..f391a24599 100644
--- a/tools/viewer/SlideDir.h
+++ b/tools/viewer/SlideDir.h
@@ -14,7 +14,12 @@
 
 class SkString;
 
-namespace sksg { class Scene; }
+namespace sksg {
+
+class Group;
+class Scene;
+
+}
 
 class SlideDir final : public Slide {
 public:
@@ -34,18 +39,27 @@ protected:
     bool onMouse(SkScalar x, SkScalar y, sk_app::Window::InputState, uint32_t modifiers) override;
 
 private:
+    struct Rec;
+    class FocusController;
+
     static constexpr int kDefaultColumnCount = 4;
 
-    struct Rec;
+    const Rec* findCell(float x, float y) const;
 
     const SkTArray<sk_sp<Slide>, true> fSlides;
+    std::unique_ptr<FocusController>   fFocusController;
     const int                          fColumns;
 
-    SkTArray<Rec, true>          fRecs;
-    std::unique_ptr<sksg::Scene> fScene;
+    SkTArray<Rec, true>                fRecs;
+    std::unique_ptr<sksg::Scene>       fScene;
+    sk_sp<sksg::Group>                 fRoot;
+
+    SkSize                             fWinSize  = SkSize::MakeEmpty();
+    SkSize                             fCellSize = SkSize::MakeEmpty();
+    SkMSec                             fTimeBase = 0;
 
-    SkISize                      fSize     = SkISize::MakeEmpty();
-    SkMSec                       fTimeBase = 0;
+    const Rec*                         fTrackingCell = nullptr;
+    SkPoint                            fTrackingPos  = SkPoint::Make(0, 0);
 
     using INHERITED = Slide;
 };